/usr/bin/pwrkap_gtk is in pwrkap-gui 7.30-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
# Start a pwrkap program
# (C) Copyright IBM Corp. 2008-2009
# Licensed under the GPLv2.
export PYTHONPATH=/usr/lib/pwrkap
exec python "$PYTHONPATH/pwrkap_gtk.py" $*
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